On Wed, 2012-03-07 at 07:06 -0600, Rob Clark wrote: > On Wed, Mar 7, 2012 at 5:59 AM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote: > > Hmm, why does the drm core care about it? > > Because it is the one generating the bus-id.. see > drivers/gpu/drm/drm_platform.c drm_platform_set_busid() > > Anyways, it's just a detail about how libdrm/drmOpen() can > differentiate between multiple instances of the same driver, similar > to how PCI bus-id is used in the desktop world. It is not difficult > to change in drm_platform_set_busid(), although not sure if that would > be considered an ABI change to userspace. (Maybe it is less critical, > I'm under the impression that other platform-drm users didn't even > realize we had a bus-id.) Ok. Well, I'm fine with id 0 also, if it makes sense in the DRM side. It was just something that caught my eye. > > Okay, let me ask the other way. Is 32MB enough for everyone? Hardcoding > > a value like that without any possibility to adjust it just sounds like > > a rather bad thing. > > The main requirement is that, on omap3 or before (platforms without > DMM) you need enough to allocate all of your scanout buffers. > > I'm not against having a bootarg to adjust, although I strongly prefer > sane defaults and not requiring a million bootargs just to boot in > some usable fashion. Well, those are two different things. I'm fine with a default of 32MB. My point was, what if I need more, or I don't need any. Tomi
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